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Influence of Support Configurations on the Characteristics of Selective Laser-Melted Inconel 718

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Abstract

Samples fabricated using two different support configurations by following identical scan strategies during selective laser melting of superalloy Inconel 718 were characterized in this study. Characterization methods included optical microscopy, electron back-scattered diffraction and x-ray diffraction residual stress measurement. For the scan strategy considered, microstructure and residual stress development in the samples were influenced by the support structures. However, crystallographic texture intensity and the texture components formed within the core part of the samples were almost independent of the support. The formation of finer grains closer to the support as well as within the columnar grain boundaries resulted in randomization and texture intensity reduction by nearly half for the sample built on a lattice support. Heat transfer rates dictated by the support configurations in addition to the scan strategy influenced the microstructure and residual stress development in selective laser-melted Inconel 718 samples.

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Acknowledgement

Authors would like to thank Dr. Gert Nolze, BAM for the help with EBSD data analysis.

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Authors and Affiliations

  1. Bundesanstalt für Materialforschung und –prüfung (BAM), Unter den Eichen 87, 12205, Berlin, Germany

    Naresh Nadammal, Arne Kromm, Romeo Saliwan-Neumann & Pedro Dolabella Portella

  2. Siemens AG, Power and Gas, Huttenstrasse 12, 10553, Berlin, Germany

    Lena Farahbod & Christoph Haberland

Authors
  1. Naresh Nadammal
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  2. Arne Kromm
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  3. Romeo Saliwan-Neumann
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  4. Lena Farahbod
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  5. Christoph Haberland
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  6. Pedro Dolabella Portella
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Correspondence to Naresh Nadammal.

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Nadammal, N., Kromm, A., Saliwan-Neumann, R. et al. Influence of Support Configurations on the Characteristics of Selective Laser-Melted Inconel 718. JOM 70, 343–348 (2018). https://doi.org/10.1007/s11837-017-2703-1

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  • DOI: https://doi.org/10.1007/s11837-017-2703-1

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